DPF Filters became standard requirements in 2009 as emissions regulations tightened. Although they help protect the environment, if your fleet doesn't drive long distances, the DPF filters are at risk of being blocked. This is because the exhaust doesn't reach a hot enough temperature to burn the soot away.
The easiest and best option to clean DPF filters is by following these few steps:
The easiest and cheapest method of DPF filter cleaning is by driving the vehicle for a long-distance at high revs per minute. Doing this increases the heat of the exhaust and burns the soot blocking the DPF filter. If the car warning light comes on, you should continue driving, this will help clear the soot.
Some vehicles may deal with the soot itself by injecting extra fuel to raise the temperature of the exhaust. This process is called 'active regeneration'. This only happens if your car is moving, as the temperature of the exhaust heats up, it burns the soot away.
The DPF collects upwards of 98% of particulate matter emissions in the form of ash, which is comprised of metallic compounds that originate in the engine oil, fuel, wear metals from the engine, or from dirt in the air the engine consumes.
“Controlling oil consumption is a principal way to maximize DPF servicing intervals,” said Shell Global Solutions OEM Technical Manager Karin Haumann. “Oil being consumed (i.e. burned) leaves behind an ash residue that comes from the non-combustible, inorganic material that is carried through the exhaust.”
Using the recommended manufactured oil can help with keeping the DPF filter clean. You should only use the specified oil as this will be specially made for your diesel vehicles.
For example, Biodiesel and renewable diesel are often marketed as convenient drop-in fuel solutions for lowering emissions. both fuels emit lower particulate matter during combustion. Less particulate matter equates to less back-pressure buildup in DPFs and fewer regen cycles.
"Biodiesel burns so much cleaner that you’re reducing that particulate matter by somewhere in the neighborhood of 50 to 60%,” said Colin Huwyler.
The DPF warning light should not be ignored. If the light comes on, do not stop driving as this can make the blockage worse. You should continue driving to clear the soot until the warning light turns off. If this doesn't work, you will need to take the vehicle to a garage to have it professionally cleaned.
To help with DPF filter cleaning, you will need to schedule regular servicing for your fleet vehicles. Services usually include an oil change by flushing out the existing oil and replacing it with new, clean oil which will help keep the DPF filter clean.
If you only drive short distances in urban areas, you may find that your DPF filters are prone to blocking. You can try these DPF filter cleaning steps, but diesel vehicles generally perform better at long-distance driving.
Conclusion
Maintaining DPF filters is essential for keeping your car running efficiently and avoiding costly repairs. While modern diesel vehicles are equipped with systems to manage soot buildup, proactive maintenance is key to preventing blockages. Encouraging long-distance driving when possible, using the correct oil and fuel, and staying on top of regular servicing can all help extend the life of your DPF filters.
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